From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f73.google.com (mail-wm1-f73.google.com [209.85.128.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 113293B8D47 for ; Thu, 19 Mar 2026 09:06:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773911185; cv=none; b=hfBrotMXrrcwJ+OaR0v33XNYzAougim3OFrnvTAsTX47BKGciCeZ/ZeiBswQBCRMLno1obMP9np5YfxdfSIIL4h5AhAPBPMpNSHe74ZJGcXn1miyYqgJO0ebPx1/DlkRLZ81h3kdWGG+d0WvE4JnvHjgYVuwUBj8kUHxPlHNd5U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773911185; c=relaxed/simple; bh=Wf8kQNEMmtzZGyUJPwnpA/dfE7IQk+3+2ogaLZM7sX4=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=lvJF9q1t03O2MX5w/czlUaVBXDK5HoX2ZI4sL6j3JOWtN9xKSeiVMTsn8fxNWSEBa3u7gc9Nc/Y4pdDYAdEvHWElZA0UP4rgTMFlQDBeTT9kme2foO/SA0y9MOgPTfOX6obqJDsvgai5SDOYT6dqiUhH+5YB0XOHCBECuEqugaA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--ardb.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=jddZIGLu; arc=none smtp.client-ip=209.85.128.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--ardb.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="jddZIGLu" Received: by mail-wm1-f73.google.com with SMTP id 5b1f17b1804b1-4853466655dso9566655e9.3 for ; Thu, 19 Mar 2026 02:06:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1773911182; x=1774515982; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=hzByK+ynICbqxc0B14saHqMa64fxvk7Hl+Eh4R4V85s=; b=jddZIGLuISgU8tC5CNzndN5ZBFWO1IjGxHw1bWHUefI3FnwGU3mqaTkrV/0NCkrZpA 9j3gGbUp3528z+uoovMm02eyCavVIi0gP52F1OvCspnT8Q1rs8ZRPnK6+NRSsOs9bUzW Ho+Y1WPRWEmxdS6TXvQbPlzgDFSCMwZOwVPq4QdCuuaWRaL+tb+evZujgG3t+BAHb+xz Mr42EheGipVZZUIwDs6bhVtqc7vVKeFVot+a4lhoMMP+MZXrzHgw8yej7Kr/Z5XiXIwK xQTV9x7YgVmnuN04iL1OJ4JdEqeAGysQBkWI+ODuo7DZoAwzJmcs7LGE0/0Zi+s+Fwea /GAw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1773911182; x=1774515982; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=hzByK+ynICbqxc0B14saHqMa64fxvk7Hl+Eh4R4V85s=; b=Exx736PtO23NTQ3HFvtEf0lIpUsGSDqI3v1yrTEaZO5d/Rv9iek4G/qpzPmHBvtOtQ 0ZS3RrcJfyT6rwO3n2tXDSn2v5/27wUVKBmpJHh87fjzYKtKPT9a+KXiwWDtnW1QJS+J 7XvCz7e5WXc/rKiO0hSQZEN6yspzUY8Tzzibd1T80tLeXSJ0oIDskDZzg9MnZu/NNE0W 9/HVb9onxFyLKfWrZYCjG2ED1+hoWwCjzG5JBAa/BLlyha565OGItZqvXmqohj+szgf2 m4aw1KRBsKZ0Xq1tfCpOCVEEZEveuQjvhYTDaQKXbz/OVtZfIl00XEr0VQbAi9SwFKzP xXEw== X-Gm-Message-State: AOJu0YwMIrSkvaIAdDBTMiTvYkgMmyHS7hs62mz91m04hoakEwcVVj8T gOHXKf3glbAvg50XoGauqRBJno4KYHr5dJp33+H1MW64dzJd7JmP8+dnLzyA3xcnrp+aW2E37Q= = X-Received: from wmlf11.prod.google.com ([2002:a7b:c8cb:0:b0:480:6c91:3efb]) (user=ardb job=prod-delivery.src-stubby-dispatcher) by 2002:a05:600c:8183:b0:486:f634:ef1 with SMTP id 5b1f17b1804b1-486f634100dmr86779245e9.17.1773911182276; 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-efi@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-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) efi.memmap.num_valid_entries = (new_md - efi.memmap.map) / efi.memmap.desc_size; + /* Free the part of the memory map allocation that has become unused */ + free_reserved_area(new_md, efi.memmap.map_end, -1, NULL); + freed += (void *)efi.memmap.map_end - new_md; + if (freed) pr_info("Freeing EFI boot services memory: %ldK\n", freed / SZ_1K); -- 2.53.0.851.ga537e3e6e9-goog