linux-kernel - [GIT PULL] memblock: fix memblock_estimated_nr_free

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Message-ID: <aR1s8Y4wP1E6-dRR@kernel.org>
Date: Wed, 19 Nov 2025 09:08:33 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Akinobu Mita <akinobu.mita@...il.com>,
	Mike Rapoport <rppt@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [GIT PULL] memblock: fix memblock_estimated_nr_free_pages() for
 soft-reserved memory

Hi Linus,

The following changes since commit e9a6fb0bcdd7609be6969112f3fbfcce3b1d4a7c:

  Linux 6.18-rc5 (2025-11-09 15:10:19 -0800)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock fixes-2025-11-19

for you to fetch changes up to c42af83c59b65d01c0f7a074e450bbbb43b22f0d:

  memblock: fix memblock_estimated_nr_free_pages() for soft-reserved memory (2025-11-11 18:15:35 +0200)

----------------------------------------------------------------
memblock: fix memblock_estimated_nr_free_pages() for soft-reserved memory

The "soft-reserved" memory regions (EFI_MEMORY_SP) are added to the
memblock.reserved, but not to the memblock.memory. It causes
memblock_estimated_nr_free_pages() to return a value smaller value than
expected, or if it underflows, an extremely large value.

Calculate the number of estimated free pages using
memblock_reserved_kern_size() instead of memblock_reserved_size() to fix
the issue.

----------------------------------------------------------------
Akinobu Mita (1):
      memblock: fix memblock_estimated_nr_free_pages() for soft-reserved memory

 mm/memblock.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

-- 
Sincerely yours,
Mike.