linux-stable-mirror

mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2026-04-24 10:49:54 +02:00

Files

T

Niklas Schnelle 088a200ebf s390: Remove ioremap_wt() and pgprot_writethrough()

[ Upstream commit c94bff63e4 ]

It turns out that while s390 architecture calls its memory-I/O mapping
variants write-through and write-back the implementation of ioremap_wt()
and pgprot_writethrough() does not match Linux notion of ioremap_wt().

In particular Linux expects ioremap_wt() to be weaker still than
ioremap_wc(), allowing not just gathering and re-ordering but also reads
to be served from cache. Instead s390's implementation is equivalent to
normal ioremap() while its ioremap_wc() allows re-ordering.

Note that there are no known users of ioremap_wt() on s390 and the
resulting behavior is in line with asm-generic defining ioremap_wt() as
ioremap(), if undefined, so no breakage is expected.

As s390 does not have a mapping type matching the Linux notion of
ioremap_wt() and pgprot_writethrough(), simply drop them and rely on the
asm-generic fallbacks instead.

Fixes: b02002cc4c ("s390/pci: Implement ioremap_wc/prot() with MIO")
Fixes: b43b3fff04 ("s390: mm: convert to GENERIC_IOREMAP")
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2025-04-10 14:39:18 +02:00

cmm.c

s390/mm: Add cond_resched() to cmm_alloc/free_pages()

2024-09-05 15:17:23 +02:00

dump_pagetables.c

Merge tag 's390-6.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2024-09-21 09:02:54 -07:00

extable.c

s390/fpu: Add fpc exception handler / remove fixup section again

2025-02-17 10:05:44 +01:00

extmem.c

…