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clear_page_erms() are wrappers around "REP; STOS" >> variations. Inlining gets rid of an unnecessary CALL/RET (which isn't >> free when using RETHUNK speculative execution mitigations.) >> Fixup and rename clear_page_orig() to adapt to the changed calling >> convention. >> And, add a comment from Dave Hansen detailing various clearing mechanisms >> used in clear_page(). >> Signed-off-by: Ankur Arora >> --- >> arch/x86/include/asm/page_32.h | 6 +++++ >> arch/x86/include/asm/page_64.h | 42 ++++++++++++++++++++++++++-------- >> arch/x86/lib/clear_page_64.S | 39 +++++++------------------------ >> 3 files changed, 46 insertions(+), 41 deletions(-) >> diff --git a/arch/x86/include/asm/page_32.h b/arch/x86/include/asm/page_32.h >> index 0c623706cb7e..a8ff43bb9652 100644 >> --- a/arch/x86/include/asm/page_32.h >> +++ b/arch/x86/include/asm/page_32.h >> @@ -17,6 +17,12 @@ extern unsigned long __phys_addr(unsigned long); >> #include >> +/* > > /** if this was supposed to be kernel doc (which it looks like it is) > >> + * clear_page() - clear kernel page. > > "clear a kernel page" > > Although I am not sure what a "kernel page" is. > > Did you mean "clear a page using a kernel virtual address" ? Thanks. Yes, this makes way more sense. > (we have a handful of "kernel page" usages, where we talk about non-user space > allocations) > >> + * @page: address of kernel page >> + * >> + * Does absolutely no exception handling. >> + */ >> static inline void clear_page(void *page) >> { >> memset(page, 0, PAGE_SIZE); >> diff --git a/arch/x86/include/asm/page_64.h b/arch/x86/include/asm/page_64.h >> index 015d23f3e01f..28b9adbc5f00 100644 >> --- a/arch/x86/include/asm/page_64.h >> +++ b/arch/x86/include/asm/page_64.h >> @@ -40,23 +40,45 @@ extern unsigned long __phys_addr_symbol(unsigned long); >> #define __phys_reloc_hide(x) (x) >> -void clear_page_orig(void *page); >> -void clear_page_rep(void *page); >> -void clear_page_erms(void *page); >> +void memzero_page_aligned_unrolled(void *addr, u64 len); >> +/* >> + * clear_page() - clear kernel page.> + * @page: address of kernel page > > Same comment as above. -- ankur