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Thomas WeißschuhandAndreas Larsson
9bc0bd9617
The loop in clear_user_pages() iterates over all pages and calls
clear_user_page() for each of them. During the loop "vaddr" is modified.
However on sparc clear_user() is a macro which does not use "vaddr".
The compiler sees a variable which is modified but never used and emits
a warning for that:
include/linux/highmem.h: In function 'clear_user_pages':
include/linux/highmem.h:234:63: warning: parameter 'vaddr' set but not used [-Wunused-but-set-parameter=]
static inline void clear_user_pages(void *addr, unsigned long vaddr,
Other architectures use an inline function for clear_user_page() which
avoids the warning. This is not possible on sparc, as
sparc_flush_page_to_ram() is not yet declared where clear_user_page() is
defined. Including cacheflush_32.h will trigger recursive and lots of
other issues.
So hide the warning with a cast to (void) instead.
While we are here, do the same for copy_user_page().
Fixes: 62a9f5a85b ("mm: introduce clear_pages() and clear_user_pages()")
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: Andreas Larsson <andreas@gaisler.com>
139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* page.h: Various defines and such for MMU operations on the Sparc for
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* the Linux kernel.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*/
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#ifndef _SPARC_PAGE_H
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#define _SPARC_PAGE_H
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#include <linux/const.h>
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#include <vdso/page.h>
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#ifndef __ASSEMBLER__
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#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
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#define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
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#define clear_user_page(addr, vaddr, page) \
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do { clear_page(addr); \
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sparc_flush_page_to_ram(page); \
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(void)(vaddr); \
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} while (0)
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#define copy_user_page(to, from, vaddr, page) \
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do { copy_page(to, from); \
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sparc_flush_page_to_ram(page); \
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(void)(vaddr); \
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} while (0)
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/* The following structure is used to hold the physical
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* memory configuration of the machine. This is filled in
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* prom_meminit() and is later used by mem_init() to set up
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* mem_map[]. We statically allocate SPARC_PHYS_BANKS+1 of
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* these structs, this is arbitrary. The entry after the
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* last valid one has num_bytes==0.
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*/
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struct sparc_phys_banks {
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unsigned long base_addr;
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unsigned long num_bytes;
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};
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#define SPARC_PHYS_BANKS 32
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extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
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/* passing structs on the Sparc slow us down tremendously... */
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/* #define STRICT_MM_TYPECHECKS */
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#ifdef STRICT_MM_TYPECHECKS
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/*
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* These are used to make use of C type-checking..
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*/
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typedef struct { unsigned long pte; } pte_t;
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typedef struct { unsigned long iopte; } iopte_t;
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typedef struct { unsigned long pmd; } pmd_t;
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typedef struct { unsigned long pgd; } pgd_t;
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typedef struct { unsigned long ctxd; } ctxd_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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typedef struct { unsigned long iopgprot; } iopgprot_t;
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#define pte_val(x) ((x).pte)
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#define iopte_val(x) ((x).iopte)
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#define pmd_val(x) ((x).pmd)
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#define pgd_val(x) ((x).pgd)
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#define ctxd_val(x) ((x).ctxd)
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#define pgprot_val(x) ((x).pgprot)
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#define iopgprot_val(x) ((x).iopgprot)
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#define __pte(x) ((pte_t) { (x) } )
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#define __pmd(x) ((pmd_t) { { (x) }, })
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#define __iopte(x) ((iopte_t) { (x) } )
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#define __pgd(x) ((pgd_t) { (x) } )
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#define __ctxd(x) ((ctxd_t) { (x) } )
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#define __pgprot(x) ((pgprot_t) { (x) } )
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#define __iopgprot(x) ((iopgprot_t) { (x) } )
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#else
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/*
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* .. while these make it easier on the compiler
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*/
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typedef unsigned long pte_t;
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typedef unsigned long iopte_t;
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typedef unsigned long pmd_t;
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typedef unsigned long pgd_t;
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typedef unsigned long ctxd_t;
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typedef unsigned long pgprot_t;
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typedef unsigned long iopgprot_t;
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#define pte_val(x) (x)
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#define iopte_val(x) (x)
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#define pmd_val(x) (x)
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#define pgd_val(x) (x)
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#define ctxd_val(x) (x)
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#define pgprot_val(x) (x)
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#define iopgprot_val(x) (x)
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#define __pte(x) (x)
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#define __pmd(x) (x)
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#define __iopte(x) (x)
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#define __pgd(x) (x)
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#define __ctxd(x) (x)
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#define __pgprot(x) (x)
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#define __iopgprot(x) (x)
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#endif
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typedef pte_t *pgtable_t;
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#define TASK_UNMAPPED_BASE 0x50000000
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#else /* !(__ASSEMBLER__) */
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#define __pgprot(x) (x)
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#endif /* !(__ASSEMBLER__) */
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#define PAGE_OFFSET 0xf0000000
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#ifndef __ASSEMBLER__
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extern unsigned long phys_base;
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extern unsigned long pfn_base;
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#endif
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#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + phys_base)
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#define __va(x) ((void *)((unsigned long) (x) - phys_base + PAGE_OFFSET))
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#define virt_to_phys __pa
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#define phys_to_virt __va
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#define ARCH_PFN_OFFSET (pfn_base)
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
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#define virt_addr_valid(kaddr) ((((unsigned long)(kaddr)-PAGE_OFFSET)>>PAGE_SHIFT) < max_mapnr)
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#include <asm-generic/memory_model.h>
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#include <asm-generic/getorder.h>
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#endif /* _SPARC_PAGE_H */
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