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Date: Fri, 22 Jan 2021 15:37:06 -0800 From: Rick Edgecombe <rick.p.edgecombe@...el.com> To: akpm@...ux-foundation.org Cc: hch@....de, dja@...ens.net, linux-mm@...ck.org, linux-kernel@...r.kernel.org, willy@...radead.org, linmiaohe@...wei.com, Rick Edgecombe <rick.p.edgecombe@...el.com> Subject: [PATCH v2] mm/vmalloc: Separate put pages and flush VM flags When VM_MAP_PUT_PAGES was added, it was defined with the same value as VM_FLUSH_RESET_PERMS. This doesn't seem like it will cause any big functional problems other than some excess flushing for VM_MAP_PUT_PAGES allocations. Redefine VM_MAP_PUT_PAGES to have its own value. Also, rearrange things so flags are less likely to be missed in the future. Fixes: b944afc9d64d ("mm: add a VM_MAP_PUT_PAGES flag for vmap") Suggested-by: Matthew Wilcox <willy@...radead.org> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com> --- [v2] Changed comment format like suggested by Matthew and listed him as Suggested-by. Dropped Reviewed-bys because all of the comment changes are different. include/linux/vmalloc.h | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index 80c0181c411d..cedcda6593f6 100644 --- a/include/linux/vmalloc.h +++ b/include/linux/vmalloc.h @@ -24,7 +24,8 @@ struct notifier_block; /* in notifier.h */ #define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */ #define VM_NO_GUARD 0x00000040 /* don't add guard page */ #define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */ -#define VM_MAP_PUT_PAGES 0x00000100 /* put pages and free array in vfree */ +#define VM_FLUSH_RESET_PERMS 0x00000100 /* reset direct map and flush TLB on unmap, can't be freed in atomic context */ +#define VM_MAP_PUT_PAGES 0x00000200 /* put pages and free array in vfree */ /* * VM_KASAN is used slighly differently depending on CONFIG_KASAN_VMALLOC. @@ -37,12 +38,6 @@ struct notifier_block; /* in notifier.h */ * determine which allocations need the module shadow freed. */ -/* - * Memory with VM_FLUSH_RESET_PERMS cannot be freed in an interrupt or with - * vfree_atomic(). - */ -#define VM_FLUSH_RESET_PERMS 0x00000100 /* Reset direct map and flush TLB on unmap */ - /* bits [20..32] reserved for arch specific ioremap internals */ /* -- 2.20.1
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