From: changbin.du@intel.com
To: yamada.masahiro@socionext.com, michal.lkml@markovi.net,
tglx@linutronix.de, mingo@redhat.com, akpm@linux-foundation.org
Cc: rostedt@goodmis.org, rdunlap@infradead.org, x86@kernel.org,
lgirdwood@gmail.com, broonie@kernel.org, arnd@arndb.de,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arch@vger.kernel.org, Changbin Du <changbin.du@intel.com>
Subject: [PATCH v2 1/5] x86/mm: surround level4_kernel_pgt with #ifdef CONFIG_X86_5LEVEL...#endif
Date: Wed, 2 May 2018 21:44:56 +0800 [thread overview]
Message-ID: <1525268700-10631-2-git-send-email-changbin.du@intel.com> (raw)
In-Reply-To: <1525268700-10631-1-git-send-email-changbin.du@intel.com>
From: Changbin Du <changbin.du@intel.com>
The level4_kernel_pgt is only defined when X86_5LEVEL is enabled. So
surround level4_kernel_pgt with #ifdef CONFIG_X86_5LEVEL...#endif to
make code correct.
Signed-off-by: Changbin Du <changbin.du@intel.com>
---
arch/x86/include/asm/pgtable_64.h | 2 ++
arch/x86/kernel/head64.c | 13 ++++++-------
2 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
index 877bc27..9e7f667 100644
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -15,7 +15,9 @@
#include <linux/bitops.h>
#include <linux/threads.h>
+#ifdef CONFIG_X86_5LEVEL
extern p4d_t level4_kernel_pgt[512];
+#endif
extern p4d_t level4_ident_pgt[512];
extern pud_t level3_kernel_pgt[512];
extern pud_t level3_ident_pgt[512];
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 0c408f8..775d7a6 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -143,16 +143,15 @@ unsigned long __head __startup_64(unsigned long physaddr,
pgd = fixup_pointer(&early_top_pgt, physaddr);
p = pgd + pgd_index(__START_KERNEL_map);
- if (la57)
- *p = (unsigned long)level4_kernel_pgt;
- else
- *p = (unsigned long)level3_kernel_pgt;
- *p += _PAGE_TABLE_NOENC - __START_KERNEL_map + load_delta;
-
+#ifdef CONFIG_X86_5LEVEL
if (la57) {
+ *p = (unsigned long)level4_kernel_pgt;
p4d = fixup_pointer(&level4_kernel_pgt, physaddr);
p4d[511] += load_delta;
- }
+ } else
+#endif
+ *p = (unsigned long)level3_kernel_pgt;
+ *p += _PAGE_TABLE_NOENC - __START_KERNEL_map + load_delta;
pud = fixup_pointer(&level3_kernel_pgt, physaddr);
pud[510] += load_delta;
--
2.7.4
next prev parent reply other threads:[~2018-05-02 13:57 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-02 13:44 [PATCH v2 0/5] kernel hacking: GCC optimization for debug experience (-Og) changbin.du
2018-05-02 13:44 ` changbin.du [this message]
2018-05-02 13:44 ` [PATCH v2 2/5] regulator: add dummy function of_find_regulator_by_node changbin.du
2018-05-02 13:44 ` [PATCH v2 3/5] kernel hacking: new config NO_AUTO_INLINE to disable compiler auto-inline optimizations changbin.du
2018-05-02 14:07 ` Steven Rostedt
2018-05-02 20:27 ` Arnd Bergmann
2018-05-03 13:00 ` Du, Changbin
2018-05-03 14:16 ` Steven Rostedt
2018-05-02 13:44 ` [PATCH v2 4/5] kernel hacking: new config DEBUG_EXPERIENCE to apply GCC -Og optimization changbin.du
2018-05-02 14:17 ` Steven Rostedt
2018-05-02 20:45 ` Andrew Morton
2018-05-03 1:19 ` Steven Rostedt
2018-05-03 13:45 ` Du, Changbin
2018-05-03 14:28 ` Steven Rostedt
2018-05-05 23:57 ` Du, Changbin
2018-05-06 0:27 ` Randy Dunlap
2018-05-02 19:26 ` Randy Dunlap
2018-05-02 13:45 ` [PATCH v2 5/5] asm-generic: fix build error in fix_to_virt with CONFIG_DEBUG_EXPERIENCE changbin.du
2018-05-02 14:19 ` Steven Rostedt
2018-05-03 13:25 ` Du, Changbin
2018-05-03 14:19 ` Steven Rostedt
2018-05-03 16:39 ` weylin
2018-05-02 14:56 ` [PATCH v2 0/5] kernel hacking: GCC optimization for debug experience (-Og) Daniel Thompson
2018-05-03 13:49 ` Du, Changbin
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