1 files changed, 0 insertions, 86 deletions
diff --git a/debian/patches-rt/0001-drm-amd-display-Remove-migrate_en-dis-from-dc_fpu_be.patch b/debian/patches-rt/0001-drm-amd-display-Remove-migrate_en-dis-from-dc_fpu_be.patch
deleted file mode 100644
index b78f988da5..0000000000
--- a/debian/patches-rt/0001-drm-amd-display-Remove-migrate_en-dis-from-dc_fpu_be.patch
+++ /dev/null
@@ -1,86 +0,0 @@
-From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
-Date: Thu, 21 Sep 2023 16:15:12 +0200
-Subject: [PATCH 1/5] drm/amd/display: Remove migrate_en/dis from
- dc_fpu_begin().
-Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz
-
-This is a revert of the commit mentioned below while it is not wrong, as
-in the kernel will explode, having migrate_disable() here it is
-complete waste of resources.
-
-Additionally commit message is plain wrong the review tag does not make
-it any better. The migrate_disable() interface has a fat comment
-describing it and it includes the word "undesired" in the headline which
-should tickle people to read it before using it.
-Initially I assumed it is worded too harsh but now I beg to differ.
-
-The reviewer of the original commit, even not understanding what
-migrate_disable() does should ask the following:
-
-- migrate_disable() is added only to the CONFIG_X86 block and it claims
-  to protect fpu_recursion_depth. Why are the other the architectures
-  excluded?
-
-- migrate_disable() is added after fpu_recursion_depth was modified.
-  Shouldn't it be added before the modification or referencing takes
-  place?
-
-Moving on.
-Disabling preemption DOES prevent CPU migration. A task, that can not be
-pushed away from the CPU by the scheduler (due to disabled preemption)
-can not be pushed or migrated to another CPU.
-
-Disabling migration DOES NOT ensure consistency of per-CPU variables. It
-only ensures that the task acts always on the same per-CPU variable. The
-task remains preemptible meaning multiple tasks can access the same
-per-CPU variable. This in turn leads to inconsistency for the statement
-
-                  *pcpu -= 1;
-
-with two tasks on one CPU and a preemption point during the RMW
-operation:
-
-     Task A                           Task B
-     read pcpu to reg  # 0
-     inc reg           # 0 -> 1
-                                      read pcpu to reg  # 0
-                                      inc reg           # 0 -> 1
-                                      write reg to pcpu # 1
-     write reg to pcpu # 1
-
-At the end pcpu reads 1 but should read 2 instead. Boom.
-
-get_cpu_ptr() already contains a preempt_disable() statement. That means
-that the per-CPU variable can only be referenced by a single task which
-is currently running. The only inconsistency that can occur if the
-variable is additionally accessed from an interrupt.
-
-Remove migrate_disable/enable() from dc_fpu_begin/end().
-
-Cc: Tianci Yin <tianci.yin@amd.com>
-Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
-Fixes: 0c316556d1249 ("drm/amd/display: Disable migration to ensure consistency of per-CPU variable")
-Link: https://lore.kernel.org/r/20230921141516.520471-2-bigeasy@linutronix.de
-Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
----
- drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c |    2 --
- 1 file changed, 2 deletions(-)
-
---- a/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
-+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/dc_fpu.c
-@@ -91,7 +91,6 @@ void dc_fpu_begin(const char *function_n
- 
- 	if (*pcpu == 1) {
- #if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
--		migrate_disable();
- 		kernel_fpu_begin();
- #elif defined(CONFIG_PPC64)
- 		if (cpu_has_feature(CPU_FTR_VSX_COMP)) {
-@@ -132,7 +131,6 @@ void dc_fpu_end(const char *function_nam
- 	if (*pcpu <= 0) {
- #if defined(CONFIG_X86) || defined(CONFIG_LOONGARCH)
- 		kernel_fpu_end();
--		migrate_enable();
- #elif defined(CONFIG_PPC64)
- 		if (cpu_has_feature(CPU_FTR_VSX_COMP)) {
- 			disable_kernel_vsx();