We no longer need to initialise it because gl_program is never reused.
---
 src/compiler/glsl/linker.cpp | 1 -
 src/mesa/main/api_validate.c | 8 ++++----
 src/mesa/main/mtypes.h       | 3 ++-
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/compiler/glsl/linker.cpp b/src/compiler/glsl/linker.cpp
index c54fe7a..785f69e 100644
--- a/src/compiler/glsl/linker.cpp
+++ b/src/compiler/glsl/linker.cpp
@@ -4707,7 +4707,6 @@ link_shaders(struct gl_context *ctx, struct 
gl_shader_program *prog)
 {
    prog->data->LinkStatus = true; /* All error paths will set this to false */
    prog->data->Validated = false;
-   prog->_Used = false;
 
    /* Section 7.3 (Program Objects) of the OpenGL 4.5 Core Profile spec says:
     *
diff --git a/src/mesa/main/api_validate.c b/src/mesa/main/api_validate.c
index cb6e203..5e19794 100644
--- a/src/mesa/main/api_validate.c
+++ b/src/mesa/main/api_validate.c
@@ -197,8 +197,8 @@ _mesa_valid_to_render(struct gl_context *ctx, const char 
*where)
       gl_shader_stage i;
 
       for (i = 0; i < MESA_SHADER_STAGES; i++) {
-        if (shProg[i] == NULL || shProg[i]->_Used
-            || shProg[i]->_LinkedShaders[i] == NULL)
+        if (shProg[i] == NULL || shProg[i]->_LinkedShaders[i] == NULL ||
+             shProg[i]->_LinkedShaders[i]->Program->_Used)
            continue;
 
         /* This is the first time this shader is being used.
@@ -214,8 +214,8 @@ _mesa_valid_to_render(struct gl_context *ctx, const char 
*where)
       }
 
       for (i = 0; i < MESA_SHADER_STAGES; i++) {
-        if (shProg[i] != NULL)
-           shProg[i]->_Used = GL_TRUE;
+        if (shProg[i] != NULL && shProg[i]->_LinkedShaders[i] != NULL)
+           shProg[i]->_LinkedShaders[i]->Program->_Used = GL_TRUE;
       }
    }
 #endif
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index b6f80aa..fa4778d 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1921,6 +1921,8 @@ struct gl_program
    GLenum Target;    /**< GL_VERTEX/FRAGMENT_PROGRAM_ARB, 
GL_GEOMETRY_PROGRAM_NV */
    GLenum Format;    /**< String encoding format */
 
+   GLboolean _Used;        /**< Ever used for drawing? Used for debugging */
+
    struct nir_shader *nir;
 
    GLbitfield64 SecondaryOutputsWritten; /**< Subset of OutputsWritten outputs 
written with non-zero index. */
@@ -2818,7 +2820,6 @@ struct gl_shader_program
     */
    struct string_to_uint_map *UniformHash;
 
-   GLboolean _Used;        /**< Ever used for drawing? */
    GLboolean SamplersValidated; /**< Samplers validated against texture units? 
*/
 
    unsigned Version;       /**< GLSL version used for linking */
-- 
2.7.4

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