File 0001-ieee1275-Increase-initially-allocated-heap... of Package grub2

Overview Repositories Revisions Requests Users Attributes Meta

File 0001-ieee1275-Increase-initially-allocated-heap-from-1-4-.patch of Package grub2 (Revision 5ed0dcb7e9d3d136fec8104aa8b4d5d0)

Currently displaying revision 5ed0dcb7e9d3d136fec8104aa8b4d5d0 , Show latest

From 41965e194599af42e77bcf2462bd9c0db2823b16 Mon Sep 17 00:00:00 2001
From: Stefan Berger <stefanb@linux.ibm.com>
Date: Tue, 1 Nov 2022 11:06:03 -0400
Subject: [PATCH] ieee1275: Increase initially allocated heap from 1/4 to 1/3

The patch 'ieee1275: claim more memory' (commit 910676645d) states:

"[...] This leaves us 381MB. 1/4 of 381MB is ~95MB. That should be enough
to verify a 30MB vmlinux and should eave plenty of space to load Linux
and the initrd."

As it turns out the memory limit of ~95MB is insufficient for the FADUMP
use case as described here:

https://bugzilla.redhat.com/show_bug.cgi?id=2139000#c1

Adjust the current memory limitation by increasing the allocation to
1/3 of 381 MB, so ~127MB.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 grub-core/kern/ieee1275/init.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/grub-core/kern/ieee1275/init.c b/grub-core/kern/ieee1275/init.c
index 0bacc2348..f75a36493 100644
--- a/grub-core/kern/ieee1275/init.c
+++ b/grub-core/kern/ieee1275/init.c
@@ -47,7 +47,7 @@
 #include <grub/lockdown.h>
 
 /* The maximum heap size we're going to claim. Not used by sparc.
-   We allocate 1/4 of the available memory under 4G, up to this limit. */
+   We allocate 1/3 of the available memory under 4G, up to this limit. */
 #ifdef __i386__
 #define HEAP_MAX_SIZE		(unsigned long) (64 * 1024 * 1024)
 #else // __powerpc__
@@ -415,7 +415,7 @@ grub_claim_heap (void)
 
   grub_machine_mmap_iterate (heap_size, &total);
 
-  total = total / 4;
+  total = total / 3;
   if (total > HEAP_MAX_SIZE)
     total = HEAP_MAX_SIZE;
 
-- 
2.35.3

Places

File 0001-ieee1275-Increase-initially-allocated-heap-from-1-4-.patch of Package grub2 (Revision 5ed0dcb7e9d3d136fec8104aa8b4d5d0)

Places