Commit 844b43adba74d97f15e56b103c97bfcccaa01aa6

Authored by Carmelo Amoroso
Committed by Paul Mundt
1 parent 3ce5445046

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>

Showing 1 changed file with 6 additions and 0 deletions Side-by-side Diff

include/asm-sh/cacheflush.h
... ... @@ -43,6 +43,12 @@
43 43 extern void __flush_invalidate_region(void *start, int size);
44 44 #endif
45 45  
  46 +#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
  47 +static inline void flush_kernel_dcache_page(struct page *page)
  48 +{
  49 + flush_dcache_page(page);
  50 +}
  51 +
46 52 #if defined(CONFIG_CPU_SH4) && !defined(CONFIG_CACHE_OFF)
47 53 extern void copy_to_user_page(struct vm_area_struct *vma,
48 54 struct page *page, unsigned long vaddr, void *dst, const void *src,