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Thu, 19 Mar 2026 02:06:22 -0700 (PDT) Date: Thu, 19 Mar 2026 10:05:49 +0100 In-Reply-To: <20260319090529.1091660-21-ardb+git@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260319090529.1091660-21-ardb+git@google.com> X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=916; i=ardb@kernel.org; h=from:subject; bh=MmnX/fkpzOzS5g7YhXoL61ypB3Du4JDzx3K+Oahbalc=; b=owGbwMvMwCVmkMcZplerG8N4Wi2JIXP3niLjpUdDS16wOQfX3j/PGq69bMfZEm+z978Lbs3fa 5pbPr+oo5SFQYyLQVZMkUVg9t93O09PlKp1niULM4eVCWQIAxenAEykWImRYdfkg05/dFVZ7h34 d2j16SezlRdtu7HMYWKTS6L+W4PVkjEM//1zlQQmfOksF7pwZn/dIfNnpxw3u235ohVQJexm3JG XywkA X-Mailer: git-send-email 2.53.0.851.ga537e3e6e9-goog Message-ID: <20260319090529.1091660-40-ardb+git@google.com> Subject: [PATCH v2 19/19] x86/efi: Free unused tail of the EFI memory map From: Ard Biesheuvel To: linux-kernel@vger.kernel.org Cc: linux-efi@vger.kernel.org, x86@kernel.org, Ard Biesheuvel , "Mike Rapoport (Microsoft)" , Benjamin Herrenschmidt Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Ard Biesheuvel After moving the relevant entries to the start of the map, the remainder can be handed back to the page allocator. Signed-off-by: Ard Biesheuvel --- arch/x86/platform/efi/quirks.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c index 8f2dc477eee0..3b3652c4b90e 100644 --- a/arch/x86/platform/efi/quirks.c +++ b/arch/x86/platform/efi/quirks.c @@ -443,6 +443,10 @@ static int __init efi_free_boot_services(void) =20 efi.memmap.num_valid_entries =3D (new_md - efi.memmap.map) / efi.memmap.d= esc_size; =20 + /* Free the part of the memory map allocation that has become unused */ + free_reserved_area(new_md, efi.memmap.map_end, -1, NULL); + freed +=3D (void *)efi.memmap.map_end - new_md; + if (freed) pr_info("Freeing EFI boot services memory: %ldK\n", freed / SZ_1K); =20 --=20 2.53.0.851.ga537e3e6e9-goog