sh: Fix an unusual memory initialisation error. (f040ddaf) · Commits · 戴 / test

This fixes a problems with the set up of Linux memory: - When reserving memory at boot time, the code previously reserved the bottom page of memory, and then from one page up to the end of the bootmap. This had the desired effect, but was strictly speaking wrong, as the one page was actually whatever CONFIG_ZERO_PAGE_OFFSET had been set to. Signed-off-by:

Stuart Menefy <stuart.menefy@st.com> Signed-off-by:

Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/setup.c

+6 −4

Original line number	Diff line number	Diff line
		@@ -233,15 +233,17 @@ void __init setup_bootmem_allocator(unsigned long free_pfn)
		* case of us accidentally initializing the bootmem allocator with
		* an invalid RAM area.
		*/
		reserve_bootmem(__MEMORY_START+PAGE_SIZE,
		(PFN_PHYS(free_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START,
		reserve_bootmem(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
		(PFN_PHYS(free_pfn) + bootmap_size + PAGE_SIZE - 1) -
		(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET),
		BOOTMEM_DEFAULT);

		/*
		* reserve physical page 0 - it's a special BIOS page on many boxes,
		* enabling clean reboots, SMP operation, laptop functions.
		*/
		reserve_bootmem(__MEMORY_START, PAGE_SIZE, BOOTMEM_DEFAULT);
		reserve_bootmem(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET,
		BOOTMEM_DEFAULT);

		sparse_memory_present_with_active_regions(0);

Admin message