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powerpc/32: Remove 'noltlbs' kernel parameter

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Mapping without large TLBs has no added value on the 8xx.

Mapping without large TLBs is still necessary on 40x when
selecting CONFIG_KFENCE or CONFIG_DEBUG_PAGEALLOC or
CONFIG_STRICT_KERNEL_RWX, but this is done automatically
and doesn't require user selection.

Remove 'noltlbs' kernel parameter, the user has no reason
to use it.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/80ca17bd39cf608a8ebd0764d7064a498e131199.1655202721.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2022-06-14 12:32:24 +02:00 committed by Michael Ellerman
parent 1ce844973b
commit 56e54b4e6c
3 changed files with 0 additions and 15 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
View File

@ -3661,9 +3661,6 @@
nolapic_timer [X86-32,APIC] Do not use the local APIC timer.
noltlbs [PPC] Do not use large page/tlb entries for kernel
lowmem mapping on PPC40x and PPC8xx
nomca [IA-64] Disable machine check abort handling
nomce [X86-32] Disable Machine Check Exception

3
arch/powerpc/mm/init_32.c
View File

@ -79,9 +79,6 @@ unsigned long __max_low_memory = MAX_LOW_MEM;
*/
static void __init MMU_setup(void)
{
if (strstr(boot_command_line, "noltlbs")) {
__map_without_ltlbs = 1;
}
if (IS_ENABLED(CONFIG_PPC_8xx))
return;

9
arch/powerpc/mm/nohash/8xx.c
View File

@ -14,8 +14,6 @@
#define IMMR_SIZE (FIX_IMMR_SIZE << PAGE_SHIFT)
extern int __map_without_ltlbs;
static unsigned long block_mapped_ram;
/*
@ -28,8 +26,6 @@ phys_addr_t v_block_mapped(unsigned long va)
if (va >= VIRT_IMMR_BASE && va < VIRT_IMMR_BASE + IMMR_SIZE)
return p + va - VIRT_IMMR_BASE;
if (__map_without_ltlbs)
return 0;
if (va >= PAGE_OFFSET && va < PAGE_OFFSET + block_mapped_ram)
return __pa(va);
return 0;
@ -45,8 +41,6 @@ unsigned long p_block_mapped(phys_addr_t pa)
if (pa >= p && pa < p + IMMR_SIZE)
return VIRT_IMMR_BASE + pa - p;
if (__map_without_ltlbs)
return 0;
if (pa < block_mapped_ram)
return (unsigned long)__va(pa);
return 0;
@ -153,9 +147,6 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top)
mmu_mapin_immr();
if (__map_without_ltlbs)
return 0;
mmu_mapin_ram_chunk(0, boundary, PAGE_KERNEL_TEXT, true);
if (debug_pagealloc_enabled_or_kfence()) {
top = boundary;