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From: Becky Bruce <beckyb@kernel.crashing.org>
To: linuxppc-dev@lists.ozlabs.org
Cc: david@gibson.dropbear.id.au
Subject: [PATCH 06/13] powerpc: Whitespace/comment changes to tlb_low_64e.S
Date: Mon, 10 Oct 2011 15:50:41 -0500	[thread overview]
Message-ID: <13182798761457-git-send-email-beckyb@kernel.crashing.org> (raw)
In-Reply-To: <13182798731357-git-send-email-beckyb@kernel.crashing.org>

From: Becky Bruce <beckyb@kernel.crashing.org>

I happened to comment this code while I was digging through it;
we might as well commit that.  I also made some whitespace
changes - the existing code had a lot of unnecessary newlines
that I found annoying when I was working on my tiny laptop.

No functional changes.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
---
 arch/powerpc/mm/tlb_low_64e.S |   28 +++++++++++-----------------
 1 files changed, 11 insertions(+), 17 deletions(-)

diff --git a/arch/powerpc/mm/tlb_low_64e.S b/arch/powerpc/mm/tlb_low_64e.S
index dc4a5f3..71d5d9a 100644
--- a/arch/powerpc/mm/tlb_low_64e.S
+++ b/arch/powerpc/mm/tlb_low_64e.S
@@ -94,11 +94,11 @@
 
 	srdi	r15,r16,60		/* get region */
 	rldicl.	r10,r16,64-PGTABLE_EADDR_SIZE,PGTABLE_EADDR_SIZE+4
-	bne-	dtlb_miss_fault_bolted
+	bne-	dtlb_miss_fault_bolted	/* Bail if fault addr is invalid */
 
 	rlwinm	r10,r11,32-19,27,27
 	rlwimi	r10,r11,32-16,19,19
-	cmpwi	r15,0
+	cmpwi	r15,0			/* user vs kernel check */
 	ori	r10,r10,_PAGE_PRESENT
 	oris	r11,r10,_PAGE_ACCESSED@h
 
@@ -120,44 +120,38 @@ tlb_miss_common_bolted:
 	rldicl	r15,r16,64-PGDIR_SHIFT+3,64-PGD_INDEX_SIZE-3
 	cmpldi	cr0,r14,0
 	clrrdi	r15,r15,3
-	beq	tlb_miss_fault_bolted
+	beq	tlb_miss_fault_bolted	/* No PGDIR, bail */
 
 BEGIN_MMU_FTR_SECTION
 	/* Set the TLB reservation and search for existing entry. Then load
 	 * the entry.
 	 */
 	PPC_TLBSRX_DOT(0,r16)
-	ldx	r14,r14,r15
-	beq	normal_tlb_miss_done
+	ldx	r14,r14,r15		/* grab pgd entry */
+	beq	normal_tlb_miss_done	/* tlb exists already, bail */
 MMU_FTR_SECTION_ELSE
-	ldx	r14,r14,r15
+	ldx	r14,r14,r15		/* grab pgd entry */
 ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_USE_TLBRSRV)
 
 #ifndef CONFIG_PPC_64K_PAGES
 	rldicl	r15,r16,64-PUD_SHIFT+3,64-PUD_INDEX_SIZE-3
 	clrrdi	r15,r15,3
-
-	cmpldi	cr0,r14,0
-	beq	tlb_miss_fault_bolted
-
-	ldx	r14,r14,r15
+	cmlpdi	cr0,r14,0
+	beq	tlb_miss_fault_bolted	/* Bad pgd entry */
+	ldx	r14,r14,r15		/* grab pud entry */
 #endif /* CONFIG_PPC_64K_PAGES */
 
 	rldicl	r15,r16,64-PMD_SHIFT+3,64-PMD_INDEX_SIZE-3
 	clrrdi	r15,r15,3
-
 	cmpldi	cr0,r14,0
 	beq	tlb_miss_fault_bolted
-
-	ldx	r14,r14,r15
+	ldx	r14,r14,r15		/* Grab pmd entry */
 
 	rldicl	r15,r16,64-PAGE_SHIFT+3,64-PTE_INDEX_SIZE-3
 	clrrdi	r15,r15,3
-
 	cmpldi	cr0,r14,0
 	beq	tlb_miss_fault_bolted
-
-	ldx	r14,r14,r15
+	ldx	r14,r14,r15		/* Grab PTE */
 
 	/* Check if required permissions are met */
 	andc.	r15,r11,r14
-- 
1.5.6.5

  reply	other threads:[~2011-10-10 20:51 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-10-10 20:50 [PATCH 0/13] Hugetlb for 64-bit Freescale Book3E Becky Bruce
2011-10-10 20:50 ` [PATCH 01/13] powerpc: Only define HAVE_ARCH_HUGETLB_UNMAPPED_AREA if PPC_MM_SLICES Becky Bruce
2011-10-10 20:50   ` [PATCH 02/13] powerpc: hugetlb: fix huge_ptep_set_access_flags return value Becky Bruce
2011-10-10 20:50     ` [PATCH 03/13] powerpc: Fix booke hugetlb preload code for PPC_MM_SLICES and 64-bit Becky Bruce
2011-10-10 20:50       ` [PATCH 04/13] powerpc: Update hugetlb huge_pte_alloc and tablewalk code for FSL BOOKE Becky Bruce
2011-10-10 20:50         ` [PATCH 05/13] powerpc: hugetlb: modify include usage for FSL BookE code Becky Bruce
2011-10-10 20:50           ` Becky Bruce [this message]
2011-10-10 20:50             ` [PATCH 07/13] powerpc: Add hugepage support to 64-bit tablewalk code for FSL_BOOK3E Becky Bruce
2011-10-10 20:50               ` [PATCH 08/13] powerpc: Add gpages reservation code for 64-bit FSL BOOKE Becky Bruce
2011-10-10 20:50                 ` [PATCH 09/13] powerpc: Kconfig updates for FSL BookE HUGETLB 64-bit Becky Bruce
2011-10-10 20:50                   ` [PATCH 10/13] powerpc: Update mpc85xx/corenet 32-bit defconfigs Becky Bruce
2011-10-10 20:50                     ` [PATCH 11/13] powerpc: Enable Hugetlb by default for 32-bit 85xx/corenet Becky Bruce
2011-10-10 20:50                       ` [PATCH 12/13] powerpc: Update corenet64_smp_defconfig Becky Bruce
2011-10-10 20:50                         ` [PATCH 13/13] powerpc: Enable hugetlb by default for corenet64 platforms Becky Bruce
2011-10-12  4:29                         ` [PATCH 12/13] powerpc: Update corenet64_smp_defconfig Kumar Gala
2011-10-12  4:29                     ` [PATCH 10/13] powerpc: Update mpc85xx/corenet 32-bit defconfigs Kumar Gala
2011-12-09 22:05                     ` Tabi Timur-B04825
2011-11-29  5:25         ` [PATCH 04/13] powerpc: Update hugetlb huge_pte_alloc and tablewalk code for FSL BOOKE Benjamin Herrenschmidt
2011-11-29 16:36           ` Becky Bruce
2011-11-30  1:10             ` David Gibson
2011-11-25  0:43       ` [PATCH 03/13] powerpc: Fix booke hugetlb preload code for PPC_MM_SLICES and 64-bit Benjamin Herrenschmidt
2011-11-28 16:01         ` Kumar Gala
2011-11-28 16:54         ` Becky Bruce
2011-11-28 22:50       ` Benjamin Herrenschmidt
2011-11-29  3:58     ` [PATCH 02/13] powerpc: hugetlb: fix huge_ptep_set_access_flags return value Benjamin Herrenschmidt
2011-11-29 16:52       ` Becky Bruce

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