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parisc: Ensure page alignment in flush functions 

commit d755bd2cae upstream.

Matthew Wilcox noticed, that if ARCH_HAS_FLUSH_ON_KUNMAP is defined
(which is the case for PA-RISC), __kunmap_local() calls
kunmap_flush_on_unmap(), which may call the parisc flush functions with
a non-page-aligned address and thus the page might not be fully flushed.

This patch ensures that flush_kernel_dcache_page_asm() and
flush_kernel_dcache_page_asm() will always operate on page-aligned
addresses.

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: <stable@vger.kernel.org> # v6.0+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Helge Deller 2023-03-15 19:25:15 +01:00 committed by Greg Kroah-Hartman
parent 359831a7d8
commit 4c08de62b1
1 changed files with 2 additions and 0 deletions
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2
arch/parisc/kernel/pacache.S
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@ -889,6 +889,7 @@ ENDPROC_CFI(flush_icache_page_asm)
ENTRY_CFI(flush_kernel_dcache_page_asm)
88: ldil L%dcache_stride, %r1
ldw R%dcache_stride(%r1), %r23
depi_safe 0, 31,PAGE_SHIFT, %r26 /* Clear any offset bits */
#ifdef CONFIG_64BIT
depdi,z 1, 63-PAGE_SHIFT,1, %r25
@ -925,6 +926,7 @@ ENDPROC_CFI(flush_kernel_dcache_page_asm)
ENTRY_CFI(purge_kernel_dcache_page_asm)
88: ldil L%dcache_stride, %r1
ldw R%dcache_stride(%r1), %r23
depi_safe 0, 31,PAGE_SHIFT, %r26 /* Clear any offset bits */
#ifdef CONFIG_64BIT
depdi,z 1, 63-PAGE_SHIFT,1, %r25