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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>
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1 changed files with 6 additions and 0 deletions
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@ -43,6 +43,12 @@ extern void __flush_purge_region(void *start, int size);
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extern void __flush_invalidate_region(void *start, int size);
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#endif
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#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
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static inline void flush_kernel_dcache_page(struct page *page)
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{
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flush_dcache_page(page);
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}
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#if defined(CONFIG_CPU_SH4) && !defined(CONFIG_CACHE_OFF)
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extern void copy_to_user_page(struct vm_area_struct *vma,
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struct page *page, unsigned long vaddr, void *dst, const void *src,
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