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54a6b89a3d
clear_page_rep() and 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. Also add a comment from Dave Hansen detailing various clearing mechanisms used in clear_page(). Link: https://lkml.kernel.org/r/20260107072009.1615991-5-ankur.a.arora@oracle.com Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com> Tested-by: Raghavendra K T <raghavendra.kt@amd.com> Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: David Hildenbrand <david@kernel.org> Cc: David Hildenbrand <david@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Konrad Rzessutek Wilk <konrad.wilk@oracle.com> Cc: Lance Yang <ioworker0@gmail.com> Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com> Cc: Li Zhe <lizhe.67@bytedance.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Mateusz Guzik <mjguzik@gmail.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
38 lines
829 B
C
38 lines
829 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_PAGE_32_H
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#define _ASM_X86_PAGE_32_H
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#include <asm/page_32_types.h>
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#ifndef __ASSEMBLER__
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#define __phys_addr_nodebug(x) ((x) - PAGE_OFFSET)
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#ifdef CONFIG_DEBUG_VIRTUAL
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extern unsigned long __phys_addr(unsigned long);
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#else
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#define __phys_addr(x) __phys_addr_nodebug(x)
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#endif
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#define __phys_addr_symbol(x) __phys_addr(x)
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#define __phys_reloc_hide(x) RELOC_HIDE((x), 0)
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#include <linux/string.h>
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/**
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* clear_page() - clear a page using a kernel virtual address.
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* @page: address of kernel page
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*
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* Does absolutely no exception handling.
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*/
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static inline void clear_page(void *page)
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{
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memset(page, 0, PAGE_SIZE);
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}
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static inline void copy_page(void *to, void *from)
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{
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memcpy(to, from, PAGE_SIZE);
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}
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#endif /* !__ASSEMBLER__ */
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#endif /* _ASM_X86_PAGE_32_H */
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