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b=2l9LWYsMPhAkmIGVHfzX32IavfM6yyhhM7uNUO9HmHZbTAz9z9kWdJU0N7G88Rlgw XYcTnUUrIgmmbdvko6C+oRgaSsKsqmjRJqwmnBkeiXmDU0dsEp+nqaKw8wM/sRgJmu gEdyppNL0n7mq2OPJqejZzcrGvsCGeBZGyy5a+PI= Date: Thu, 26 Mar 2026 18:34:20 -0700 From: Andrew Morton To: Suren Baghdasaryan Cc: Hao Ge , Kent Overstreet , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] mm/alloc_tag: clear codetag for pages allocated before page_ext initialization Message-Id: <20260326183420.bbcbef02b8d2f3dedc4c4980@linux-foundation.org> In-Reply-To: References: <20260326140554.191996-1-hao.ge@linux.dev> <20260326181145.35b559956a45b0efdc9c0450@linux-foundation.org> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: mamwtyabu3xqe45y83xgxoo3z8wzjt6d X-Rspamd-Queue-Id: 68FAB80004 X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1774575262-264808 X-HE-Meta: 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 ly2pwvWX b3DhQdn7pdEIcHrS7KniBnkB/crqKHDDbEuJjsmlgpwSy6oYw3A0zXDxYrJAayweWVlIJ+ZnhF1z0wR/mlEczO5zobnbxJx4R0HklJ2gtAG+y2IqsA+Mq3R8FBQhHc7snubydV4ZUPgwmH/XzNyOa+xPF+/d9le/hhzCNE4sjy6cLfiVgT/Q0flKzhNUxLdZtOVN11u4cpGUjYN+0aBMExadGE9PKUhyjSc+ZZvrZOlwdKGtUJGyR6jnQ9apwhqB1klF3b3SyJiJ1dsZinvNrXxpQW9JjxUTkS3IBPRIuDO5A2cmZINzKo4uHXjuBM6L/VMhgq8Hpo+nGAlNSWI9w3k7eVfzPCiPKmzNaxz3LpaFE7vNKO7+R0fKbEO/LgLYjv0dI Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, 26 Mar 2026 18:19:56 -0700 Suren Baghdasaryan wrote: > > > > Do people use CONFIG_MEM_ALLOC_PROFILING_DEBUG much? Is a backport > > really needed? > > IMO backport would be good. OK, thanks, I'll slap a cc:stable on it and keep it in the 7.1.rc1 queue. I added "This bug occurs when CONFIG_MEM_ALLOC_PROFILING_DEBUG=y." somewhere in the changelog but that's pretty lame and could be expanded upon in a respin. > > > > Either way, it seems that this isn't a very urgent issue so I'm > > inclined to add it to the 7.1-rc1 pile, perhaps with a cc:stable. > > > > Please all share your thoughts with me, thanks. > > I'm reviewing and testing the patch and there is a race and a couple > of smaller issues. I'll post a reply later today. Cool. I was going to keep it in there for mm-new testing (which is light). But I guess there isn't much value in this so I'll drop v2. Sashiko had a bunch of nags, but I think you're checking that routinely? https://sashiko.dev/#/patchset/20260326140554.191996-1-hao.ge%40linux.dev