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mm: remove PG_error

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The PG_error bit is now unused; delete it and free up a bit in
page->flags.

Link: https://lkml.kernel.org/r/20240807193528.1865100-2-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2024-08-07 20:35:26 +01:00 committed by Andrew Morton
parent 420e05d0de
commit 09022bc196
4 changed files with 2 additions and 8 deletions
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1
fs/proc/page.c
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@ -182,7 +182,6 @@ u64 stable_page_flags(const struct page *page)
#endif
u |= kpf_copy_bit(k, KPF_LOCKED, PG_locked);
u |= kpf_copy_bit(k, KPF_ERROR, PG_error);
u |= kpf_copy_bit(k, KPF_DIRTY, PG_dirty);
u |= kpf_copy_bit(k, KPF_UPTODATE, PG_uptodate);
u |= kpf_copy_bit(k, KPF_WRITEBACK, PG_writeback);

6
include/linux/page-flags.h
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@ -66,8 +66,6 @@
* PG_referenced, PG_reclaim are used for page reclaim for anonymous and
* file-backed pagecache (see mm/vmscan.c).
*
* PG_error is set to indicate that an I/O error occurred on this page.
*
* PG_arch_1 is an architecture specific page state bit. The generic code
* guarantees that this bit is cleared for a page when it first is entered into
* the page cache.
@ -103,7 +101,6 @@ enum pageflags {
PG_waiters, /* Page has waiters, check its waitqueue. Must be bit #7 and in the same byte as "PG_locked" */
PG_active,
PG_workingset,
PG_error,
PG_owner_priv_1, /* Owner use. If pagecache, fs may use*/
PG_arch_1,
PG_reserved,
@ -183,7 +180,7 @@ enum pageflags {
*/
/* At least one page in this folio has the hwpoison flag set */
PG_has_hwpoisoned = PG_error,
PG_has_hwpoisoned = PG_active,
PG_large_rmappable = PG_workingset, /* anon or file-backed */
};
@ -506,7 +503,6 @@ static inline int TestClearPage##uname(struct page *page) { return 0; }
__PAGEFLAG(Locked, locked, PF_NO_TAIL)
FOLIO_FLAG(waiters, FOLIO_HEAD_PAGE)
PAGEFLAG(Error, error, PF_NO_TAIL) TESTCLEARFLAG(Error, error, PF_NO_TAIL)
FOLIO_FLAG(referenced, FOLIO_HEAD_PAGE)
FOLIO_TEST_CLEAR_FLAG(referenced, FOLIO_HEAD_PAGE)
__FOLIO_SET_FLAG(referenced, FOLIO_HEAD_PAGE)

1
include/trace/events/mmflags.h
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@ -100,7 +100,6 @@
#define __def_pageflag_names \
DEF_PAGEFLAG_NAME(locked), \
DEF_PAGEFLAG_NAME(waiters), \
DEF_PAGEFLAG_NAME(error), \
DEF_PAGEFLAG_NAME(referenced), \
DEF_PAGEFLAG_NAME(uptodate), \
DEF_PAGEFLAG_NAME(dirty), \

2
include/uapi/linux/kernel-page-flags.h
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@ -7,7 +7,7 @@
*/
#define KPF_LOCKED 0
#define KPF_ERROR 1
#define KPF_ERROR 1 /* Now unused */
#define KPF_REFERENCED 2
#define KPF_UPTODATE 3
#define KPF_DIRTY 4