linux-kernel - [PATCH v2 2/6] mm, page_flags: remove PG_slob

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Message-Id: <20230317104307.29328-3-vbabka@suse.cz>
Date:   Fri, 17 Mar 2023 11:43:03 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Pekka Enberg <penberg@...nel.org>
Cc:     Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        rcu@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        linux-doc@...r.kernel.org, Vlastimil Babka <vbabka@...e.cz>,
        Lorenzo Stoakes <lstoakes@...il.com>
Subject: [PATCH v2 2/6] mm, page_flags: remove PG_slob_free

With SLOB removed we no longer need the PG_slob_free alias for
PG_private. Also update tools/mm/page-types.

Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
Acked-by: Hyeonggon Yoo <42.hyeyoo@...il.com>
Acked-by: Lorenzo Stoakes <lstoakes@...il.com>
---
 include/linux/page-flags.h | 4 ----
 tools/mm/page-types.c      | 6 +-----
 2 files changed, 1 insertion(+), 9 deletions(-)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index a7e3a3405520..2bdc41cb0594 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -174,9 +174,6 @@ enum pageflags {
 	/* Remapped by swiotlb-xen. */
 	PG_xen_remapped = PG_owner_priv_1,
 
-	/* SLOB */
-	PG_slob_free = PG_private,
-
 #ifdef CONFIG_MEMORY_FAILURE
 	/*
 	 * Compound pages. Stored in first tail page's flags.
@@ -483,7 +480,6 @@ PAGEFLAG(Active, active, PF_HEAD) __CLEARPAGEFLAG(Active, active, PF_HEAD)
 PAGEFLAG(Workingset, workingset, PF_HEAD)
 	TESTCLEARFLAG(Workingset, workingset, PF_HEAD)
 __PAGEFLAG(Slab, slab, PF_NO_TAIL)
-__PAGEFLAG(SlobFree, slob_free, PF_NO_TAIL)
 PAGEFLAG(Checked, checked, PF_NO_COMPOUND)	   /* Used by some filesystems */
 
 /* Xen */
diff --git a/tools/mm/page-types.c b/tools/mm/page-types.c
index 381dcc00cb62..8d5595b6c59f 100644
--- a/tools/mm/page-types.c
+++ b/tools/mm/page-types.c
@@ -85,7 +85,6 @@
  */
 #define KPF_ANON_EXCLUSIVE	47
 #define KPF_READAHEAD		48
-#define KPF_SLOB_FREE		49
 #define KPF_SLUB_FROZEN		50
 #define KPF_SLUB_DEBUG		51
 #define KPF_FILE		61
@@ -141,7 +140,6 @@ static const char * const page_flag_names[] = {
 
 	[KPF_ANON_EXCLUSIVE]	= "d:anon_exclusive",
 	[KPF_READAHEAD]		= "I:readahead",
-	[KPF_SLOB_FREE]		= "P:slob_free",
 	[KPF_SLUB_FROZEN]	= "A:slub_frozen",
 	[KPF_SLUB_DEBUG]	= "E:slub_debug",
 
@@ -478,10 +476,8 @@ static uint64_t expand_overloaded_flags(uint64_t flags, uint64_t pme)
 	if ((flags & BIT(ANON)) && (flags & BIT(MAPPEDTODISK)))
 		flags ^= BIT(MAPPEDTODISK) | BIT(ANON_EXCLUSIVE);
 
-	/* SLOB/SLUB overload several page flags */
+	/* SLUB overloads several page flags */
 	if (flags & BIT(SLAB)) {
-		if (flags & BIT(PRIVATE))
-			flags ^= BIT(PRIVATE) | BIT(SLOB_FREE);
 		if (flags & BIT(ACTIVE))
 			flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN);
 		if (flags & BIT(ERROR))
-- 
2.39.2