Commit d755bd2c authored Mar 15, 2023 by Helge Deller

parisc: Ensure page alignment in flush functions



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+

parent 829632da

arch/parisc/kernel/pacache.S

+2 −0

Original line number	Diff line number	Diff line
		@@ -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