[PATCH v5 2/3] arm64: vmlinux.ld: Add mmuoff text and data sections
From: catalin.marinas@arm.com (Catalin Marinas)
Date: 2016-08-22 17:56:07
On Mon, Aug 22, 2016 at 06:35:18PM +0100, James Morse wrote:
quoted hunk ↗ jump to hunk
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index 659963d40bb4..97c3f36ce30b 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S@@ -120,6 +120,9 @@ SECTIONS IRQENTRY_TEXT SOFTIRQENTRY_TEXT ENTRY_TEXT + __mmuoff_text_start = .; + *(.mmuoff.text) + __mmuoff_text_end = .; TEXT_TEXT SCHED_TEXT LOCK_TEXT@@ -185,6 +188,24 @@ SECTIONS _data = .; _sdata = .; RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE) + + /* + * Data written with the MMU off but read with the MMU on requires + * cache lines to be invalidated, discarding up to a Cache Writeback + * Granule (CWG) of data from the cache. Keep the section that + * requires this type of maintenance to be in its own Cache Writeback + * Granule (CWG) area so the cache maintenance operations don't + * don't interfere with adjacent data. + */
Nitpick: you have "don't" twice in the comment above. -- Catalin