Commit 844b43ad authored Jan 07, 2008 by Carmelo Amoroso Committed by Paul Mundt Jan 07, 2008

sh: Fix argument page dcache flushing regression.

In the do_execve() path, argument page handling used to explicitly call
flush_dcache_page() for each page, this has since been reworked and
uses flush_kernel_dcache_page() instead, which is presently a nop.

Doing a simple modprobe/rmmod in a loop under busybox consistently
manages to crash without providing a sane flush_kernel_dcache_page()
implementation, so, plug in a simple implementation.

Signed-off-by: Carmelo Amoroso <carmelo73@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

parent 3ce54450

include/asm-sh/cacheflush.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -43,6 +43,12 @@ extern void __flush_purge_region(void *start, int size);
		extern void __flush_invalidate_region(void *start, int size);
		#endif

		#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
		static inline void flush_kernel_dcache_page(struct page *page)
		{
		flush_dcache_page(page);
		}

		#if defined(CONFIG_CPU_SH4) && !defined(CONFIG_CACHE_OFF)
		extern void copy_to_user_page(struct vm_area_struct *vma,
		struct page page, unsigned long vaddr, void dst, const void *src,