On Wed, Jan 20, 2021 at 05:41:18PM -0800, Rick Edgecombe wrote: > 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, move the comment > and remove whitespace for VM_KASAN such that the flags lower down are less > likely to be missed in the future.
Er ... I think the problem was that VM_FLUSH_RESET_PERMS was put away from all the other flags! Why not this? diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index 938eaf9517e26..458c41b99215e 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. cannot 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 */ /*
