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Message-Id: <20171204150608.119117743@linutronix.de>
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Date: Mon, 04 Dec 2017 15:07:46 +0100
From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: x86@kernel.org, Linus Torvalds <torvalds@linux-foundation.org>,
        Andy Lutomirsky <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
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        Will Deacon <will.deacon@arm.com>, daniel.gruss@iaik.tugraz.at
Subject: [patch 40/60] x86: PMD align entry text
References: <20171204140706.296109558@linutronix.de>
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From: Thomas Gleixner <tglx@linutronix.de>

The (irq)entry text must be visible in the user space page tables. To allow
simple PMD based sharing, make the entry text PMD aligned.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
 arch/x86/kernel/vmlinux.lds.S |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -61,11 +61,17 @@ jiffies_64 = jiffies;
 		. = ALIGN(HPAGE_SIZE);				\
 		__end_rodata_hpage_align = .;
 
+#define ALIGN_ENRTY_TEXT_BEGIN	. = ALIGN(PMD_SIZE);
+#define ALIGN_ENRTY_TEXT_END	. = ALIGN(PMD_SIZE);
+
 #else
 
 #define X64_ALIGN_RODATA_BEGIN
 #define X64_ALIGN_RODATA_END
 
+#define ALIGN_ENRTY_TEXT_BEGIN
+#define ALIGN_ENRTY_TEXT_END
+
 #endif
 
 PHDRS {
@@ -102,8 +108,10 @@ SECTIONS
 		CPUIDLE_TEXT
 		LOCK_TEXT
 		KPROBES_TEXT
+		ALIGN_ENRTY_TEXT_BEGIN
 		ENTRY_TEXT
 		IRQENTRY_TEXT
+		ALIGN_ENRTY_TEXT_END
 		SOFTIRQENTRY_TEXT
 		*(.fixup)
 		*(.gnu.warning)